[MacPorts] #63785: rspamd @3.1: builds failing for macOS 10.13 and earlier

[MacPorts]

#63785: rspamd @3.1: builds failing for macOS 10.13 and earlier
----------------------+-----------------------
  Reporter:  mascguy  |      Owner:  essandess
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.1
Resolution:           |   Keywords:
      Port:  rspamd   |
----------------------+-----------------------

Comment (by Christopher Nielsen <mascguy@…>):

 In [changeset:"c7c1275034bf05247cd5e44b10325ff747ae5756/macports-ports"
 c7c1275034bf05247cd5e44b10325ff747ae5756/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="c7c1275034bf05247cd5e44b10325ff747ae5756"
 legacy-support-devel: update to 20230701 commit
 - Add support for open_memstream
 See: https://github.com/macports/macports-legacy-support/pull/59
 See: https://trac.macports.org/ticket/63785
 }}}

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Ticket URL: <https://trac.macports.org/ticket/63785#comment:6>
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